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con meta = fn (db :: Type, widget :: Type) =>
{Nam : string,
Show : db -> xbody,
Widget : nm :: Name -> xml form [] [nm = widget],
WidgetPopulated : nm :: Name -> db -> xml form [] [nm = widget],
Parse : widget -> db,
Inject : sql_injectable db}
fun default [t] (sh : show t) (rd : read t) (inj : sql_injectable t) name : meta (t, string) =
{Nam = name,
Show = txt,
Widget = fn [nm :: Name] => <xml><textbox{nm}/></xml>,
WidgetPopulated = fn [nm :: Name] n =>
<xml><textbox{nm} value={show n}/></xml>,
Parse = readError,
Inject = _}
val int = default
val float = default
val string = default
fun bool name = {Nam = name,
Show = txt,
Widget = fn [nm :: Name] => <xml><checkbox{nm}/></xml>,
WidgetPopulated = fn [nm :: Name] b =>
<xml><checkbox{nm} checked={b}/></xml>,
Parse = fn x => x,
Inject = _}
fun textarea name = {Nam = name,
Show = cdata,
Widget = fn [nm :: Name] => <xml><br/><textarea{nm} rows={10} cols={80}/></xml>,
WidgetPopulated = fn [nm :: Name] s => <xml><br/>
<textarea{nm} rows={10} cols={80}>{[s]}</textarea>
</xml>,
Parse = fn s => s,
Inject = _}
fun allWidgets [ts ::: {(Type * Type)}] (r : $(map meta ts)) (fl : folder ts) =
foldR [meta] [fn ts :: {(Type * Type)} => xml form [] (map snd ts)]
(fn [nm :: Name] [t :: (Type * Type)] [rest :: {(Type * Type)}]
[[nm] ~ rest] (col : meta t) (acc : xml form [] (map snd rest)) => <xml>
<b>{[col.Nam]}</b>: {col.Widget [nm]}<br/>
{useMore acc}
</xml>)
<xml/>
[_] fl r
fun allPopulatedTr [ts ::: {(Type * Type)}] (r : $(map meta ts)) (vs : $(map fst ts)) (fl : folder ts) =
foldR2 [meta] [fst] [fn cols :: {(Type * Type)} =>
xml [Body, Form, Tr] [] (map snd cols)]
(fn [nm :: Name] [p :: (Type * Type)] [rest :: {(Type * Type)}] [[nm] ~ rest]
(m : meta p) v (acc : xml [Body, Form, Tr] [] (map snd rest)) =>
<xml>
<td>{m.WidgetPopulated [nm] v}</td>
{useMore acc}
</xml>)
<xml/>
[_] fl r vs
fun ensql [avail] [ts ::: {(Type * Type)}] (r : $(map meta ts)) (vs : $(map snd ts)) (fl : folder ts) =
map2 [meta] [snd] [fn ts :: (Type * Type) => sql_exp avail [] [] ts.1]
(fn [ts] meta v => @sql_inject meta.Inject (meta.Parse v))
[_] fl r vs
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